#| Copyright (C) 2025 Peter McGoron
 |
 | This program is free software: you can redistribute it and/or modify it
 | under the terms of the GNU General Public License as published by the
 | Free Software Foundation, either version 3 of the License, or (at your
 | option) any later version.
 |
 | This program is distributed in the hope that it will be useful, but
 | WITHOUT ANY WARRANTY; without even the implied warranty of
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 | General Public License for more details.
 |
 | You should have received a copy of the GNU General Public License along
 | with this program.  If not, see <https://www.gnu.org/licenses/>.
 |#

(define-module (mcgoron guix foment)
  #:use-module (guix packages)
  #:use-module (guix licenses)
  #:use-module (guix git-download)
  #:use-module (gnu packages version-control)
  #:use-module (gnu packages bash)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system)
  #:use-module (guix build-system copy)
  #:use-module (guix gexp))

(define-public foment-build-system
  (let ((lower* (build-system-lower copy-build-system)))
    (build-system
     (name 'foment-scheme)
     (description "Build system for copying Scheme libraries to Foment module directory")
     (lower
      (lambda args
        (apply lower*
               (if (memq #:install-plan args)
                   args
                   (append
                    args
                    (list
                     #:install-plan
                     `'(("." ,(string-append foment-lib-dir
                                             "/"))))))))))))


(define-public foment-lib-dir "share/foment")

(define-public foment
  (package
    (name "foment")
    (version "6089c3c")
    (source
      (origin
         (method git-fetch)
         (uri (git-reference (url "https://github.com/leftmike/foment")
                             (commit "6089c3c9e762875f619ef382d27943819bbe002b")))
         (sha256 (base32 "1a6q8qfd6ggc6fl9lf1d8m20q8k498jrswc4qcn3bb7rkq4w258a"))))
    (build-system gnu-build-system)
    (native-search-paths (list
                          (search-path-specification
                           (variable "FOMENT_LIBPATH")
                           (files (list foment-lib-dir)))))
    (arguments 
      (list
       #:phases
        #~(modify-phases %standard-phases
            (delete 'configure)
            (add-before 'build 'patch-makefile
              (lambda* (#:key outputs #:allow-other-keys)
                (substitute* "unix/makefile"
                  (("sudo *") "")
                  (("git rev-parse --abbrev-ref HEAD") "echo \"master\"")
                  (("git rev-parse --short HEAD") "echo 6089c3c"))
;; Replace hardcoded path /bin/sh with the current interpreter.
;; This follows what racket does:
;; https://issues.guix.gnu.org/47180
                (substitute* "src/base.scm"
                  (("\"/bin/sh\"")
                   (let ((sh (which "sh")))
                     (string-append "(if (file-exists? \"" sh "\")\n"
                                    "    \"" sh "\"\n" 
                                    "    \"/bin/sh\")"))))))
            (replace 'build
              (lambda _
                (with-directory-excursion "unix"
                  (invoke "make"))))
            (replace 'check
              (lambda* (#:key tests? #:allow-other-keys)
                (when tests?
                  (with-directory-excursion "unix"
                    (invoke "make" "test")
                    (invoke "make" "stress-test")))))
            (replace 'install
              (lambda* (#:key outputs #:allow-other-keys)
                 (let ((bin (string-append (assoc-ref outputs "out")
                                           "/bin")))
                 (install-file "unix/release/foment" bin)
                 (copy-recursively "unix/debug/foment"
                                   (string-append bin "/foment-debug"))))))))
    (home-page "https://github.com/leftmike/foment")
    (synopsis "Foment is an implementation of R7RS Scheme.")
    (license expat)
    (inputs '())
    (native-inputs (list bash))
    (description "Foment is an implementation of Scheme.")))